n. The elastic, aëriform fluid into which water is converted when heated to the boiling point; water in the state of vapor.n. The mist formed by condensed vapor; visible vapor; -- so called in popular usage.n. Any exhalation.verb-intransitive. To emit steam or vapor.verb-intransitive. To rise in vapor; to issue, or pass off, as vapor.verb-intransitive. To move or travel by the agency of steam.verb-intransitive. To generate steam.v. To exhale.v. To expose to the action of steam; to apply steam to for softening, dressing, or preparing